iptables rule and/or proxy server help request

[Mike Burger]

I've got a pretty good iptables firewall in place which, at present, 
allows fairly broad access to the net from the machines behind the 
firewall.

What I'd like to do, now, is have the firewall forward outbound packets 
for port 80 (to any address) to port 8080 on my server, which will then 
proxy (DansGuardian+Squid or Privoxy).

I've tried this (keeping in mind that I'm trying it for one system, first, 
before implementing it network-wide):

$IPTABLES -t nat -A PREROUTING -s 192.168.0.4 -p tcp --dport 80 -j DNAT 
--to 192.168.0.1:8080
$IPTABLES -A FORWARD -i eth1 -p tcp --dport 80 -m state --state NEW -d 
192.168.0.1 -j ACCEPT

I've tried using a "REDIRECT", but then connections go absolutely 
nowhere...it seems that REDIRECT only works on the local system, not 
across the network.

But then the proxies don't actually grab any info and present it back to 
the browser.

If I set up direct proxy connections in the browsers, though, to the proxy 
server at 8080, it works just fine.

Maybe it's not an iptables setting, but a proxy server setting I want?  
I'm at a loss.
-- 
Mike Burger
http://www.bubbanfriends.org

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